Stage 2 Installation Order

Just took delivery of the Stage 2 parts from Riva. I installed the Stage 1 parts last December (14/19R, Free flow, Wedge, Intake Grate, Power Filter & SC Washers) What is the best order to install the Stage 2 parts (15/20R, Block Offs, Thru hull, SC impeller & Intercooler).
For example: I figure the pump should come off before taking out the OPAS.